- Expanded cohort 2 (open to accrual 7/19/02): Patients receive fowlpox vaccine IM once every 4 weeks for up to 4 doses. Upon disease progression, patients receive fowlpox vaccine as above and IL-2 IV every 8 hours for a maximum of 12 doses beginning 24 hours after fowlpox vaccine. (Closed to accrual 12/4/03.) In all cohorts, 3-4 weeks after the last injection, patients achieving a complete remission may receive a maximum of an additional 2 courses of therapy. Patients with responding disease may receive repeat vaccinations for up to 8 courses. Patients with no response or progressive disease in cohorts not receiving IL-2 may be treated with fowlpox vaccine and IL-2 as in cohort 3. Patients who are randomized to receive IL-2 may not receive additional IL-2 therapy.